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Fix excessive CPU usage on Windows, as described in https://github.com/flutter/flutter/issues/78517#issuecomment-846436695

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This commit is contained in:
Yuriy Skalko 2021-08-09 07:28:52 +00:00
parent 7e270c352f
commit 3b67ae8a14
1 changed files with 4 additions and 31 deletions
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35
windows/runner/run_loop.cpp
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@ -9,37 +9,10 @@ RunLoop::RunLoop() {}
RunLoop::~RunLoop() {} RunLoop::~RunLoop() {}
void RunLoop::Run() { void RunLoop::Run() {
bool keep_running = true; MSG msg;
TimePoint next_flutter_event_time = TimePoint::clock::now(); while (GetMessage(&msg, nullptr, 0, 0)) {
while (keep_running) { TranslateMessage(&msg);
std::chrono::nanoseconds wait_duration = DispatchMessage(&msg);
std::max(std::chrono::nanoseconds(0),
next_flutter_event_time - TimePoint::clock::now());
::MsgWaitForMultipleObjects(
0, nullptr, FALSE, static_cast<DWORD>(wait_duration.count() / 1000),
QS_ALLINPUT);
bool processed_events = false;
MSG message;
// All pending Windows messages must be processed; MsgWaitForMultipleObjects
// won't return again for items left in the queue after PeekMessage.
while (::PeekMessage(&message, nullptr, 0, 0, PM_REMOVE)) {
processed_events = true;
if (message.message == WM_QUIT) {
keep_running = false;
break;
}
::TranslateMessage(&message);
::DispatchMessage(&message);
// Allow Flutter to process messages each time a Windows message is
// processed, to prevent starvation.
next_flutter_event_time =
std::min(next_flutter_event_time, ProcessFlutterMessages());
}
// If the PeekMessage loop didn't run, process Flutter messages.
if (!processed_events) {
next_flutter_event_time =
std::min(next_flutter_event_time, ProcessFlutterMessages());
}
} }
} }